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2008. World Wildlife Fund (WWF). This drainage direction map for Australasia defines the direction of flow from each cell in the conditioned digital elevation model to its steepest... U.S. Geological Survey.

2008. World Wildlife Fund (WWF). This drainage direction map for Australasia defines the direction of flow from each cell in the conditioned digital elevation model to its steepest... U.S. Geological Survey.

2008. World Wildlife Fund (WWF). This drainage direction map for Europe defines the direction of flow from each cell in the conditioned digital elevation model to its steepest down... U.S. Geological Survey.

2008. World Wildlife Fund (WWF). This drainage direction map for Europe defines the direction of flow from each cell in the conditioned digital elevation model to its steepest down... U.S. Geological Survey.